Fitch Ratings affirms GSMS 2015-GS1 classes, revises two outlooks to stable

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Fitch affirms GSMS 2015-GS1 outlooks

Highlights

Fitch affirms eight GSMS 2015-GS1 classes, cutting deal-level 'Bsf' rating case loss to 9.1% from 10.5%, with pool balance down 77.9% to $181.1 million as of April 2026.
Class B and X-B outlooks revised to Stable from Negative due to higher credit enhancement and loan modifications, but class C and PEZ remain Negative amid Glenbrook Square, South Plains Mall, and Deerfield Crossing risks.
Glenbrook Square's 81.0% occupancy and 1.65x NOI DSCR in 4Q25 prompt a 45.8% rating case loss; Deerfield Crossing remains in special servicing at 42.2% occupancy, and South Plains Mall receives an extension to November 2029 post-modification.

Rating action reflects paydown and concentrated loan risk

As reported by Fitch Ratings, the agency affirms eight classes of GSMS 2015-GS1 and says the actions reflect generally stable pool performance alongside improved loss expectations. Fitch says deal-level 'Bsf' rating case loss declines to 9.1% from 10.5% at the prior rating action in May 2025, while the pool's aggregate balance falls 77.9% to $181.1 million as of the April 2026 distribution date from $820.6 million at issuance.

At the same time, the remaining pool is highly concentrated and exposed to adverse selection. All remaining loans are Fitch Loans of Concern, five loans representing 71.7% of the pool are in special servicing, and all but South Plains Mall and Glenbrook Square are past their scheduled maturity dates.

Fitch says the outlook revision to Stable from Negative for class B and X-B reflects higher credit enhancement from loans that repay in full since the prior review, as well as modifications and maturity extensions for the two largest loans. Negative outlooks on class C and PEZ remain tied to elevated loss expectations on Glenbrook Square, South Plains Mall and Deerfield Crossing, with additional downgrade risk if specially serviced assets fail to stabilize or face lower valuations and longer resolution timelines.

Retail malls and office exposure shape credit outlook

The largest contributor to expected losses is Glenbrook Square in Fort Wayne, Indiana, a super-regional mall loan that returned to the master servicer in November 2025 after a loan assumption and modification closed in August 2025. Fitch says a new sponsor acquires the property, contributes $10 million to cure arrears and other shortfalls, and secures an extension through November 2030, while the trust receives excess cash and interest-only payments on the outstanding balance.

Occupancy at Glenbrook Square stands at 81.0% in November 2025, compared with 82.3% in April 2024, and the 4Q25 servicer-reported NOI DSCR improves to 1.65x from 1.14x at year-end 2022. Even so, Fitch assigns a 45.8% 'Bsf' rating case loss before concentration add-ons, citing a high capitalization rate, stress to net operating income and elevated default risk tied to anchor tenant rollover concerns.

Deerfield Crossing in Mason, Ohio is the second largest loss contributor and remains under special servicing after transferring in September 2023 for imminent monetary default. Fitch says foreclosure is filed in November 2023, a receiver is appointed in January 2024, and occupancy improves only modestly to 42.2% in January 2026 from 40.5% in June 2025 after a steep multiyear decline linked largely to Cengage Learning's space reduction.

South Plains Mall in Lubbock, Texas is the third largest loss contributor, but Fitch views its risk as lower after a February 2026 modification extends maturity by four years through November 2029. The property posts 81.6% occupancy as of December 2025 and a YE 2025 DSCR of 1.98x, leading Fitch to assign an 18.9% 'Bsf' rating case loss before concentration add-ons, although office exposure in the broader pool continues to weigh on lower-rated classes.

In our earlier coverage of JPMCC 2012-C8, we noted the CMBS deal had amortized down to a single $44.0 million Houston office-backed loan (Ashford Office Complex) after shrinking from its original $1.1 billion pool. We outlined that the loan was in special servicing and treated as a loan of concern, with a modification and extended resolution timeline alongside steep valuation declines that drive elevated loss expectations for the remaining certificateholders.

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